[Exercise 03] Caesar Cipher Decoder

Question

You have received an encrypted message from Julius Caesar-- the message is ebiil.  You are asked to decipher the message in order to understand what Caesar trying to say to you.

Hint

Luckily, Caesar has given you a hint, he says: 'I, myself, encoded the message by shifting every word backwards by 3.' 

Solution

Write a program that receives 5 characters 'ebiil'. Then decode those characters into 5 new characters.

Example

#include <stdio.h>

int main(int argc, char *argv[]) {


	char a;
    	char b;
	 	
	scanf("%c%c", &a, &b);
	
	//decode the message how??
	
	printf("%c%c", a,b);
	
	return 0;
}

Input

ebiil

 

 

 

 

 

 

 

 

 

 

Output

hello

** REMEMBER ** 
This is an online-compiler, don't put anything except the codes. If you want to make a comment, please use // or /* */

Answer 1

Hidden content!
#include<stdio.h>

int main (int argc,char *argv)
{
    char a;
   * **** *   ** *****   ** **  * * b;
*    *****  ** **** * * ** * *  c;
 * ** ** *****  * **  *  *  d;
*  ** ****  *   ***** ****   e;

    * *      * ** **      * ***     ** *  ** * * *  **  ** **** ***** *  ****   *  * **   * 

 * *  ** * *   **** *****  *    * 
 **   * *** ** ****** *   *** *
****      * ******** *    * 
 *** **** **   *** ** ** ** * ** **
**   *** * *** **   ** * *    *

 ***      **  *  *     ***     *   ***   *   * *** **   ***  *
 ** * ****  *  * * * *    ** *    * 0;
}

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 2

Hidden content!
#include ***  ** ** ** 
int main(int argc, char *argv[]) {


  *  **  ***** char a;
* *  * **   *   *** ** **** * ** b;
*    * ** * *** ****  * **   * c;
*  ****   * **    **       ** *  *  d;
 * *  *** ***   ****   ** ****  *  e;
* *      *  *   *     ** **  * **   
  *  *    ** **   *      ** ** ****** *   * ***   * ***      **   *    *   **
******* * * * ****  
 * *    *  *     the message how??
**      * *  
   ** *****  ** *** *** * * **** * * **   *    ** ***    *
** *** **  * **** 
*  *    ***  * * return 0;
}

Comments

prog.c: In function 'main':
prog.c:10:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%c%c%c%c%c", &a, &b, &c, &d, &e);
  ^~~~~
prog.c:10:2: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:10:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:14:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
  printf("%c%c%c%c%c", a+3,b+3,c+3,d+3,e+3);
  ^~~~~~
prog.c:14:2: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:14:2: note: include '<stdio.h>' or provide a declaration of 'printf'

---

Case 0: Correct output
Case 1: Wrong output

Answer 3

Hidden content!
int main(int argc, char *argv[]) {


** ** *   char a;
*   **  * ****     *         b;
******  **   ** char c;
  **  **  * *  * **  * *  * * * *  d;
*    ***  ** *  * *  ** * e;
***    *  **  ****** *  ***  **** ***  *    
     ***** * * * %c %c %c %c * * * * * ** *       ****  **   *** ** *   ****** 
*  ** * **   
        * *** **  *   * * *  **   ****  * ** * **    ***    *   ****  * *     *
*   * *  * *** ***** *  ** ** 
*  **  *        **  **  *** * * 
***   * * * *        **** ** 
  * *  * * * * **  *  * **  **
  * *  * **  *  *   **  *
 *** **    ** * **** *** * *  *  **  **      ****   ** 
***  **  *** ***  *      ** 
  * ***  ****  * *  0;
}

Comments

prog.c: In function 'main':
prog.c:10:2: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
  scanf("%c %c %c %c %c %c", &a, &b,&c, &d,&e);
  ^~~~~
prog.c:10:2: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:10:2: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:10:25: warning: format '%c' expects a matching 'char *' argument [-Wformat=]
  scanf("%c %c %c %c %c %c", &a, &b,&c, &d,&e);
                         ^
prog.c:12:6: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
      ^
prog.c:12:12: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
            ^
prog.c:12:18: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
                  ^
prog.c:12:24: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
                        ^
prog.c:12:30: warning: assignment makes integer from pointer without a cast [-Wint-conversion]
  if(a="e",b="b",c="i",d="i",e="l")
                              ^
prog.c:14:2: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
  printf("hello");
  ^~~~~~
prog.c:14:2: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:14:2: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:18:5: warning: incompatible implicit declaration of built-in function 'printf'
     printf("errol");
     ^~~~~~
prog.c:18:5: note: include '<stdio.h>' or provide a declaration of 'printf'

Answer 4

Hidden content!
*     *     ** *** ***

*      *   *  ** * * * {

*       **
  = ***  
* = *** * *
* =  * ** *
* =   *** *
 = ***  *

e = **
   = ***
 * = **
** =   **

  ***  *
**   * 
* *  **
 **    *
*** ***

 *      ***  ** **  ** ** **  ** *
 *

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 5

Hidden content!
*   * **  **** *  * * *

**     * * *         *  * {

    *    
* = ** **** 
  = *  * *
  =  ** * 
* =  **** 
** =     * *

e =   
* =   * 
** =    
  = * 

   **** *
** * ** 
* * *  
***  **  
 *     

*** ** *** *  *   *       *      
  

Comments

Case 0: Correct output
Case 1: Wrong output

Answer 6

Hidden content!
#include *      **  ** *
#include  *     ***** * 

int main(int argc, char *argv[]) {
** ***** *   **  ***    * letterj;
*** ****** *  ** *      *  *  * letteri;
***** ** **  * ***   * *       * letterm;
** * **    * ***   ****  * * *     * lettere;
****  ***    **  *  ** * * lettern;
** ** **  * *** *** ***  **
 ****** * ** * *   ****** ** **** ** *  **   input the letter to encode: ");  
*    *  **   ***   **   * * 
*     * *         *  *  ***    *****  * *     * *  ***  &letterj, * *    *** *  &letterm,  *  *  *  ** * ** * * **** 
**  * * **  * * *** *****  +3;
  *  * ****  *   *  *****  * * ***    +3;
 * ***  *      * ** *** * *  ***   * +3;
  *** * *   ****** *     *   ** * *   +3;
  * * *    * **  *  *   * **** * * **   +3;
** **   *  ***   *   ***
  ****   *  **** *****    
* *    *** * *  *  *  *  *   *  * ***   **  * * *   * ***   **  *  ** lettere, lettern);
*  *     ***    ** *  ***  ** *
*****   * *   ** ** ***     * * 0;
}


INPUT
 *  * ** *  *   ***
***** * *   * * 
OUTPUT
      * ***   ***

Comments

prog.c:27:1: error: unknown type name 'INPUT'
 INPUT
 ^~~~~
prog.c:30:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'OUTPUT'
 OUTPUT
 ^~~~~~
prog.c:30:1: error: unknown type name 'OUTPUT'

Answer 7

Hidden content!
* ***** *** * **  *  ****

int ** ** argc, char  ***  {


 **  *** * ** ** char a;
***  *  *   *  ******** * **  *    *   char b;
 *  * * * *  ** *   * *** ****  * * ** 
* *   *  * * **   ** * ** * * **  * * **              ***
*      *   **  
    ** *   * **   * * *  * the    * how??
 * **   * ** 
 *  * *  * *       ***  * ***  **** a,b);
* **      *  **  
   ** *  **  **  *  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 8

Hidden content!
#include    * *  *  **

int main(int argc, char *argv[])
{
 **    * *********  letterj;
   * **  **   **** ** * * *  letteri;
**  ** ** *  ******  * *   * **** letterm;
** *****  **** **   *  **   * lettere;
 *   *  *   ** **   *  * *  *   ** lettern;
* ***   ** ***  * * ** ***   
*** ** ****  * *    ** *** * ***   **  * ** input the letter to encode:  ***   **   * * 
* ** * * ** * *  * ****  * *   * * *   *      * **  ** * **** *  **  *   ***  *      *   *  *      *  ** *   
*    **** * *****  ***   ** * 
** ** *** **   * **  *  ***  *** = letterj +3;
  ** **  *  * ** ***  *** *  **  = letteri +3;
*** **** **   ****  ****** * = letterm +3;
 *** *     * *** * ** * ** *   = lettere +3;
   **  * **** *****  *    **  *  **   = lettern +3;
 * *   ** ** * * **   ** **
   *** **** *** **  * *** ** * **  ** **  *****            *** *   **   lettere, lettern);
** * *   *  *   *** **  ** 

 ** * * * ** * ***  * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output

Answer 9

Hidden content!
**   *   **    ***   * 

*   ** * *    **  **  * ** {

** * ***
** =     * *
 * = *    **
i = *******  
** =  *** *
   = **  *
e = **  
  = **  
  =  *
   = * *

  * *** *
*   ** *
  *** **
* ***
 *** *** 

* ***  ***  * ******   **  * *  * 
* 

Comments

prog.c:1:16: fatal error: stdio: No such file or directory
 #include<stdio>
                ^
compilation terminated.

---

prog.c: In function 'main':
prog.c:6:5: error: 'cin' undeclared (first use in this function)
     cin >> a;
     ^~~
prog.c:6:5: note: each undeclared identifier is reported only once for each function it appears in
prog.c:11:5: error: 'cout' undeclared (first use in this function)
     cout << a << endl << endl;
     ^~~~
prog.c:11:18: error: 'endl' undeclared (first use in this function)
     cout << a << endl << endl;
                  ^~~~

---

prog.c: In function 'main':
prog.c:6:11: warning: too many arguments for format [-Wformat-extra-args]
     scanf("c", &a);
           ^~~
prog.c:11:14: warning: format '%c' expects argument of type 'int', but argument 2 has type 'char *' [-Wformat=]
     printf("%c", a)
              ^
prog.c:12:5: error: expected ';' before 'return'
     return 0;
     ^~~~~~

---

prog.c: In function 'main':
prog.c:6:11: warning: too many arguments for format [-Wformat-extra-args]
     scanf("c", &a);
           ^~~
prog.c:11:14: warning: format '%c' expects argument of type 'int', but argument 2 has type 'char (*)[5]' [-Wformat=]
     printf("%c", &a);
              ^

---

Case 0: Correct output
Case 1: Wrong output

Answer 10

Hidden content!
#include   *  * * * 
#include  *  *     ** *    

int main(int argc, char *argv[]) {
 *****   *  * * * * ***** ** letterj;
** * ** *  **** **    *****  * letteri;
* * * * * *** * * *  *  ***   letterm;
** *  **  * *** ***  ***  ** ** lettere;
 *       **   **** * ***** *** ** lettern;
****  *  **  * ** ** *     * * 
*** *  * **    ** * ** ****   *   **** *  input the letter to encode: ****  *  *  
  **  *  *     ** *  ****** **  * *    * ***** *   *** **    **  * **  * *  ** **** **   *****         **** ** * **   * *** *** * ** * * *   ****
* * *  * *   *   * **      * *
 ** ***   ** * letterj = letterj +3;
**** **   *  ***** * *** ****** = letteri +3;
* *  * ** *****  * **  ***   *** * * = letterm +3;
 ****    ** ***  *   *  * **  = lettere +3;
* *** * * **  ******* **** *****  = lettern +3;
***     ** ** * * ******  
********* *  *    *    ** ***  **  *****    *  * *       ** *   **** **  * *  *  *** lettere, lettern);
 * *  *  ******  *******
* *   **   * ***       ***  ****  0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output